Orthopaedic surgical instrument assembly for reaming a patient's acetabulum

Abstract

A surgical instrument assembly includes a metallic hemispherical component and a driver component removably coupled to the hemispherical component. The metallic hemispherical component has a convex outer surface configured to engage a patient's natural acetabulum, a concave inner surface positioned opposite the outer surface and defining a cavity in the hemispherical component, a plurality of cutting teeth extending outwardly from the outer surface, and a plurality of apertures defined in the inner surface. The driver component has a shank and a plurality of ribs secured to, and extending outwardly from, the shank. Each rib has a tab that is received in a corresponding aperture of the hemispherical component to secure the driver component to the hemispherical component.

The invention claimed is: 
     
       1. A surgical instrument assembly comprising:
 a metallic hemispherical component including (i) a convex outer surface configured to engage a patient's natural acetabulum, (ii) a concave inner surface positioned opposite the outer surface and defining a cavity in the hemispherical component, (iii) a plurality of cutting teeth extending outwardly from the outer surface, and (iv) a plurality of apertures defined in the inner surface, wherein each aperture of the plurality of apertures is rectangular-shaped and extends through the inner surface and the outer surface, and 
 a driver component removably coupled to the hemispherical component, the driver component comprising a shank and a plurality of ribs secured to, and extending radially outwardly from, the shank, wherein each rib has an outer end that is spaced apart and separated from every other rib, and each rib includes a tab that is received in a corresponding aperture of the hemispherical component to secure the driver component to the hemispherical component. 
 
     
     
       2. The surgical instrument assembly of  claim 1 , wherein the cavity is hemispherical. 
     
     
       3. The surgical instrument assembly of  claim 1 , wherein the driver component is formed from a polymeric material. 
     
     
       4. The surgical instrument assembly of  claim 3 , wherein the polymeric material is injection-molded plastic. 
     
     
       5. The surgical instrument assembly of  claim 1 , wherein each rib of the plurality of ribs includes (i) a strut extending outwardly from the shank, (ii) an arm defining the outer end of the rib, and (iii) the tab extending from the arm and being received in the corresponding aperture of the hemispherical component. 
     
     
       6. The surgical instrument assembly of  claim 5 , wherein the arm of each rib includes an arcuate outer surface that engages the concave inner surface of the hemispherical component. 
     
     
       7. The surgical instrument assembly of  claim 5 , wherein the struts are arranged to receive a surgical instrument to transmit rotational power from the surgical instrument to the hemispherical component. 
     
     
       8. The surgical instrument assembly of  claim 5 , wherein the driver component is formed as a single monolithic component. 
     
     
       9. The surgical instrument assembly of  claim 5 , wherein the inner surface extends inwardly from a circular rim of the hemispherical component to define the cavity, and the hemispherical component includes a plurality of retainers that extend from the circular rim to engage the plurality of ribs of the driver component. 
     
     
       10. The surgical instrument assembly of  claim 9 , wherein each arm includes a shoulder that is positioned between a corresponding pair of retainers of the plurality of retainers of the hemispherical component. 
     
     
       11. The surgical instrument assembly of  claim 1 , wherein an angle is defined between each rib of the plurality of ribs, each angle having a magnitude of approximately 90 degrees. 
     
     
       12. A surgical instrument assembly comprising:
 a first component including (i) an outer surface configured to engage a patient's natural acetabulum, (ii) an inner surface positioned opposite the outer surface and defining a hemispherical cavity in the first component, (iii) a plurality of cutting teeth extending outwardly from the outer surface, and (iv) a plurality of apertures defined in the inner surface, 
 a second component comprising a single monolithic frame having a plurality of ribs, the frame including a plurality of tabs, wherein each tab of the plurality of tabs is positioned on an outer end of a different rib, each tab being received in a corresponding aperture of the plurality of apertures, and 
 a surgical instrument configured to be secured to the frame of the second component to transmit rotational power from the surgical instrument to the first component. 
 
     
     
       13. The surgical instrument of  claim 12 , wherein the first component is formed from a metallic material. 
     
     
       14. The surgical instrument of  claim 13 , wherein the second component is formed from a polymeric material. 
     
     
       15. The surgical instrument assembly of  claim 12 , wherein the frame of the second component includes:
 a shank, 
 a strut extending outwardly from the shank, each strut being secured to the surgical instrument, and 
 an arm defining the outer end of the rib, each arm having a tab of the plurality of tabs extending outwardly therefrom. 
 
     
     
       16. The surgical instrument assembly of  claim 12 , wherein the inner surface extends inwardly from a circular rim of the first component to define the hemispherical cavity, and the first component includes a plurality of retainers that extend from the circular rim to engage the frame of the second component. 
     
     
       17. A surgical instrument assembly comprising:
 a metallic hemispherical component including (i) a convex outer surface configured to engage a patient's natural acetabulum, (ii) a concave inner surface positioned opposite the outer surface and defining a cavity in the hemispherical component, (iii) a plurality of cutting teeth extending outwardly from the outer surface, and (iv) a plurality of apertures defined in the inner surface, and 
 a driver component removably coupled to the hemispherical component, the driver component formed from a polymeric material and comprising a shank and a plurality of ribs secured to, and extending radially outwardly from, the shank, wherein each rib has an outer end that is spaced apart and separated from every other rib, and each rib includes a tab that is received in a corresponding aperture of the hemispherical component to secure the driver component to the hemispherical component. 
 
     
     
       18. The surgical instrument assembly of  claim 17 , wherein the polymeric material is injection-molded plastic. 
     
     
       19. A surgical instrument assembly comprising:
 a metallic hemispherical component including (i) a convex outer surface configured to engage a patient's natural acetabulum, (ii) a concave inner surface positioned opposite the outer surface and defining a cavity in the hemispherical component, (iii) a plurality of cutting teeth extending outwardly from the outer surface, and (iv) a plurality of apertures defined in the inner surface, and 
 a driver component removably coupled to the hemispherical component, the driver component comprising a shank and a plurality of ribs secured to, and extending radially outwardly from, the shank, wherein each rib has an outer end that is spaced apart and separated from every other rib, and each rib includes a tab that is received in a corresponding aperture of the hemispherical component to secure the driver component to the hemispherical component, 
 wherein each rib of the plurality of ribs includes (i) a strut extending outwardly from the shank, (ii) an arm defining the outer end of the rib, the arm of each rib including an arcuate outer surface that engages the concave inner surface of the hemispherical component, and (iii) the tab extending from the arm and being received in the corresponding aperture of the hemispherical component. 
 
     
     
       20. A surgical instrument assembly comprising:
 a metallic hemispherical component including (i) a convex outer surface configured to engage a patient's natural acetabulum, (ii) a concave inner surface positioned opposite the outer surface and defining a cavity in the hemispherical component, (iii) a plurality of cutting teeth extending outwardly from the outer surface, and (iv) a plurality of apertures defined in the inner surface, and 
 a driver component removably coupled to the hemispherical component, the driver component formed as a single monolithic component and comprising a shank and a plurality of ribs secured to, and extending radially outwardly from, the shank, wherein each rib has an outer end that is spaced apart and separated from every other rib, and each rib includes a tab that is received in a corresponding aperture of the hemispherical component to secure the driver component to the hemispherical component, 
 wherein each rib of the plurality of ribs includes (i) a strut extending outwardly from the shank, (ii) an arm defining the outer end of the rib, and (iii) the tab extending from the arm and being received in the corresponding aperture of the hemispherical component.